I took delivery of my P85D on 12/31/2014. For the first five months of 2015 I kept the same PG&E rate schedule I had prior to owning an electric car. That is, the tiered (E1) plan. Not surprising to me, my electric costs increased during this period. Then, beginning June 1st, I switched to the electric vehicle plan (EVA). Now looking at my data for June and July I see that my electric costs have gone down. But something very interesting also happened. When I compare June 2014 ($197) to June 2015 ($153), and July 2014 ($211) to July 2015 ($205), my electric costs have dropped so much that I am now paying less per month than I did last year - before I owned the Model S. In other words, charging my car at home is better than free!!